Now for Nissin DI 466 I use for my Olympus camera system E-PL2.
The processing can be described as good.
Thanks to the 4 AA batteries which even burst shooting with the flash provide enough power in my camera possible.
The flash is light-strong, has a tilting flash head and is characterized by a very intuitive operation. Few operating button and clear status LED's on the back to facilitate the application and is beginner friendly.
The Nissin can do even more: It can be wirelessly operated as a so-called servo-flash. This means you can Nissin freely in space place (stand included) and trigger the camera's internal flash. This works even if you are using a master flash or the Transmitter ST-E2 and want to possibly combine multiple Nissin flashes with conventional slave flashes on or. Then, however, the flash intensity must manually on Nissin be regulated as required.
The flash unit also can be used both in TTL and also run manual mode. Again, you will receive at any time information about the status LEDs.
The extensive equipment completes the Nissin with Aufhellreflektor and the wide-angle diffuser and also has an autofocus assist lamp (not supported by all cameras) The Quick Reference Guide (detailed instructions in German on the Nissin homepage) is clearly explained so the man quickly with the flash copes even as a beginner.